Growth optimization and characterization of a-axis oriented Y-Ba-Cu-O thin films on [100] LaSrGaO/sub 4/ substrates

Author

Trajanovic, Z. ; Takeuchi, I. ; Warburton, P.A. ; Lobb, C.J. ; Venkatesan, T. ; Ogale, S.

Author_Institution

Dept. of Phys., Maryland Univ., College Park, MD, USA

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

1237

Lastpage

1240

Abstract

We have grown high quality a-axis oriented YBa/sub 2/Cu/sub 3/O/sub 7-x//PrBa/sub 2/Cu/sub 3/O/sub 7-y/ films on [100] LaSrGaO/sub 4/ substrates. We have optimized the crystalline orientation and the superconducting properties of our films. We have performed annealing studies on a- and c-axis films in vacuum and oxygen to compare the oxygen depletion of the films and found that T/sub c/ degradation of a-axis films is comparable to that of c-axis films. To further optimize the a-axis films for trilayer junction fabrication, we significantly reduced the surface roughness of the films by a gradual lowering of oxygen pressure during the deposition.<>

Keywords

Josephson effect; annealing; barium compounds; high-temperature superconductors; optimisation; praseodymium compounds; pulsed laser deposition; superconducting thin films; superconducting transition temperature; surface topography; yttrium compounds; Josephson junctions; LaSrGaO/sub 4/; LaSrGaO/sub 4/(100) substrates; O depletion; YBa/sub 2/Cu/sub 3/O/sub 7-x//PrBa/sub 2/Cu/sub 3/O/sub 7-y/; YBa/sub 2/Cu/sub 3/O/sub 7/-PrBa/sub 2/Cu/sub 3/O/sub 7/; a-axis oriented thin films; annealing; c-axis films; crystalline orientation; growth characterization; growth optimization; high temperature superconductors; superconducting properties; superconducting transition temperature degradation; surface roughness reduction; trilayer junction fabrication; Granular superconductors; High temperature superconductors; Josephson junctions; Physics; Pulsed laser deposition; Substrates; Superconducting films; Superconducting thin films; Transistors; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.402785

Filename

402785